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Infrared Narrowband Tomography of the Local Starburst NGC 1569 with the Large Binocular Telescope/LUCIFER
Quirrenbach, A.; Rix, H. -W.; Brandner, W. +24 more
We used the near-IR imager/spectrograph LUCIFER mounted on the Large Binocular Telescope to image, with subarcsecond seeing, the local dwarf starburst NGC 1569 in the JHK bands and He I 1.08 µm, [Fe II] 1.64 µm, and Brγ narrowband filters. We obtained high-quality spatial maps of He I 1.08 µm, [Fe II] 1.64 µm, and Brγ emiss…
The 100 Myr Star Formation History of NGC 5471 from Cluster and Resolved Stellar Photometry
Pérez, Enrique; Cerviño, Miguel; Díaz, Ángeles I. +2 more
We show that star formation in the giant H II region NGC 5471 has been ongoing during the past 100 Myr. Using Hubble Space Telescope/Wide-Field Planetary Camera 2 F547M and F675W, ground-based JHK s , and GALEX FUV and NUV images, we have conducted a photometric study of the star formation history (SFH) in the massive giant extragalact…
Ultraviolet Discoveries at Asteroid (21) Lutetia by the Rosetta Alice Ultraviolet Spectrograph
Scherrer, J. R.; Stern, S. A.; Feldman, P. D. +11 more
The NASA Alice ultraviolet (UV) imaging spectrograph on board the ESA Rosetta comet orbiter successfully conducted a series of flyby observations of the large asteroid (21) Lutetia in the days surrounding Rosetta's closest approach on 2010 July 10. Observations included a search for emission lines from gas, and spectral observations of the Lutetia…
Spectroscopic Study of the HST/ACS PEARS Emission-line Galaxies
Pirzkal, Norbert; Xia, Lifang; Malhotra, Sangeeta +6 more
We present spectroscopy of 76 emission-line galaxies (ELGs) in Chandra Deep Field South taken with the LDSS3 spectrograph on the Magellan Telescope. These galaxies are selected because they have emission lines with the Advanced Camera for Surveys (ACS) grism data in the Hubble Space Telescope Probing Evolution and Reionization Spectroscopically (P…
Characterization of Optically Selected Star-Forming Knots in (U)LIRGs
Arribas, Santiago; Colina, Luis; Duc, Pierre-Alain +1 more
We present a comprehensive characterization of the general properties (luminosity functions (LFs), mass, size, ages, etc.) of optically selected compact stellar objects (knots) in a representative sample of 32 low-z luminous and ultraluminous infrared galaxies ((U)LIRGs). It is important to understand the formation and evolution of these propertie…
A Two-dimensional Map of the Color Excess in NGC 3603
Grebel, Eva K.; Pang, Xiaoying; Pasquali, Anna
Using archival Hubble Space Telescope/Wide Field Camera 3 images centered on the young HD 97950 star cluster in the giant H II region NGC 3603, we computed the pixel-to-pixel distribution of the color excess, E(B - V)g, of the gas associated with this cluster from its Hα/Paβ flux ratio. At the assumed distance of 6.9 kpc, the resulting …
Far-infrared Imaging of Post-asymptotic Giant Branch Stars and (Proto)-planetary Nebulae with the AKARI Far-Infrared Surveyor
García-Lario, P.; García-Hernández, D. A.; Manchado, A. +1 more
By tracing the distribution of cool dust in the extended envelopes of post-asymptotic giant branch stars and (proto)-planetary nebulae ((P)PNe), we aim to recover, or constrain, the mass-loss history experienced by these stars in their recent past. The Far-Infrared Surveyor (FIS) instrument on board the AKARI satellite was used to obtain far-infra…
Physical Structure of the Planetary Nebula NGC 3242 from the Hot Bubble to the Nebular Envelope
Guerrero, Martín A.; Chu, You-Hua; Gruendl, Robert A. +1 more
One key feature of the interacting stellar winds model of the formation of planetary nebulae (PNe) is the presence of shock-heated stellar wind confined in the central cavities of PNe. This so-called hot bubble should be detectable in X-rays. Here we present XMM-Newton observations of NGC 3242, a multiple-shell PN whose shell morphology is consist…
VII Zw 403: H I Structure in a Blue Compact Dwarf Galaxy
Östlin, Göran; Brinks, Elias; Elmegreen, Bruce G. +9 more
We present optical (UBVJ), ultraviolet (FUV, NUV), and high-resolution atomic hydrogen (H I) observations of the nearby blue compact dwarf (BCD), VII Zw 403. We find that VII Zw 403 has a relatively high H I mass-to-light ratio for a BCD. The rotation velocity is nominally 10-15 km s-1, but rises to ~20 km s-1 after correctio…
Variable Stars in Large Magellanic Cloud Globular Clusters. I. NGC 1466
Pritzl, Barton J.; Smith, Horace A.; De Lee, Nathan +3 more
This is the first in a series of papers studying the variable stars in Large Magellanic Cloud globular clusters. The primary goal of this series is to better understand how the RR Lyrae stars in Oosterhoff-intermediate systems compare to those in Oosterhoff I/II systems. In this paper, we present the results of our new time-series BV photometric s…